Robert Muir created LUCENE-4717:
-----------------------------------
Summary: Lucene40's DocValues (sometimes?) have a bogus extra
ordinal
Key: LUCENE-4717
URL: https://issues.apache.org/jira/browse/LUCENE-4717
Project: Lucene - Core
Issue Type: Bug
Components: core/index
Affects Versions: 4.1, 4.0
Reporter: Robert Muir
Fix For: 4.2
I committed the following commented out check in CheckIndex:
{noformat}
if (seenOrds.cardinality() != sortedValues.getValueCount()) {
// TODO: find the bug here and figure out a workaround (we can
implement in LUCENE-4547's back compat layer maybe)
// basically ord 0 is unused by any docs: so the sortedbytes ords are
all off-by-one
// does it always happen? e.g. maybe only if there are missing values?
or a bug in its merge optimizations?
// throw new RuntimeException("dv for field: " + fieldName + " has
holes in its ords, valueCount=" + sortedValues.getValueCount() + " but only
used: " + seenOrds.cardinality());
}
{noformat}
I'd really like to have this check in CheckIndex, and so it would be great to
understand the conditions when the bug happens, and if we can correct it
on-the-fly in Lucene40DocValuesReader in LUCENE-4547 branch... otherwise we
will have to conditionalize the check based on when the segment was written (it
will ultimately be corrected on merge, just annoying)
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